The StandardToMetric function converts a US Standard Measure into a Metric
Measure. There are three required arguments: standardmeasure, conversion and
extensiontype. Standardmeasure: the US Standard measure to convert (This must be
a number only)
Conversion: use the table below for values:

conversion argument

converts:

in-cm

inches to centimeters

ft-cm

feet to centimeters

in-m

inches to meters

yd-m

yards to meters

mi-km

miles to kilometers

oz-g

ounces to grams

lbs-g

pounds to grams

oz-kg

ounces to kilogram

lbs-kg

pounds to kilograms

pt-l

pints to liters

qt-l

quarts to liters

gal-l

gallons to liters

Extensiontype is an integer that specifies the type of extension to append to
the converted value: